Post by John
Hi modelgunfan,
Welcome to the Forum. Finally, someone from HK to post, after 15 months since this Forum was up.
I also have the same question for a long time. However, I'm not surprised that it won't easily fit the real guns. I have M9 & M1911 from MGC, Marushin and Haw San. The magazines are not 100% compatible to one another.
Having said that, I think there are likely some parts from modelguns could fit to the real guns, e.g. the sights, grips. You know, you could buy these real gun parts in HK freely to fit to the airsoft & modelguns.